Brake mechanism for talking-machines



'M. NYSTROM.

BRAKE MECHANISM FOR TALKlNG MACHINES.

APPLICATION FILED MAY20,1918.

Patented Dec. 7,1920.

Inventor UNITED STATES PATENT OFFICE.

MARTIN NYSTROM, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BRUNSWIGK-BALKE- COLLENDER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

BRAKE MECHANISM FOR TALKING-MACHINES.

Specification of Letters Patent.

Patented Dec. '7, 1920.

Application filed May 20, 1918. Serial N0. 235,471.

' To all whom it may concern:

Be it known that I, MARTIN NYSTROM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Brake Mechanism for 'llalking-Machines, of which the following is a specification.

This invention relates to talking machines and has for its primary object the provision of a simple and effective brake mechanism whereby the motor may be released or sto oped at will.

A further object of my invention is the provision of a brake mechanism adapted to be automatically actuated to stop the. motor.

A still further object of my invention is the provision of an automatic brake mechanism having conveniently arranged means whereby the mechanism may be adjusted to vary the point in operation of the talking machine at which the brake is applied.

Further objects and advantages of my invention reside in the various combinations hereinafter claimed as will be better understood by reference to the following specification when read in connection with the accompanying drawing, illustrating the preferred embodiment thereof, in which Figure 1 is a plan view of the invention;

Fig. 2 is an elevation of a portion of the talking machine motor illustrating the application of my invention thereto, and

Fig. 3 is a view in perspective of a portion of the brake mechanism.

Referring to the drawing, 5 indicates the frame of a motor which may be of any usual or desired construction, being provided with the usual spindle 6 to receive the record table (not shown) and governor 7 to regulate the speed of rotation of the spindle. The governor is preferably inclosed in a drum 8 and a. brake lever 9 is pivotally mounted at 10 on the frame and provided with a pad 11 adapted to engage the periphery of the drum 8 under suitable actuation to prevent rotation of the governor and thus stop the mechanism. I

The motor frame 5 is supported on the under side of a motor board 12. A base plate 12 is secured to the motor board 12 by screws 14. An L-shaped spindle 15 is rotatably mounted and adapted to engage in a suitable notch in the end of the lever 9. A spindle lever 16 is secured to the of the talking machine.

upper end of the spindle 15 and is provided with an arm 16 and an abutment 17 the latter being adapted to be engaged by the hook shaped end 18 of a locking lever 19 mounted on a pivot 20 on the base plate 13. A spring 21 is mounted between a shoulder 22 on the lever 19 and corresponding shoulder 23 on the arm 16. Preferably the looking lever 19 and the arm 16 are provided with extensions 2 1-. and 25 to form supports for the spring. An operating lever 26 is mounted on the upper end of the spindle 15 and is provided with a handle 27 and with a depending lug 28 which engages the spindle lever 16. In the drawings the looking lever is shown engaged with the spindle lover to hold the same in locked position with the brake pad released from the drum. This engagement of the locking lever and the spindle lever is effected by moving the handle 27 of the operating lever upward, Fig. 1, thereby causing the lug 28 to engage spindle lever 16 and shift said lever until the hook end 18 engages the abutment 17. The hook end 18 is maintained in proper operative relation to the spindle lever by the spring 21. lVhen the hook end 18 is disengaged from abutment 17, as hereafter described,

the spring 21 will move the spindle lever,

in a clockwise direction, thereby turning the spindle 15 and operating the brake lever 9 to apply the brake pad to the drum and sto 3 the motor.

. setting lever 29 is mounted on the pivot 20 above the locking lever 19 and is held in close engagement with the latter by a spring washer.30 so that both levers are normally caused to operate in unison. The end 31 of the setting lever 29 is disposed in the path of movement of a depending lug or arm 32 secured to the tone arm (not shown) lVhen the tone arm is swung during the operation of the talking machine to a predetermined point in its travel the lug 32 engages the end 81 of the lever 29 swinging the levers 29 and 19 about the pivot 20 and withdrawing the hook shaped end 18 from the abutment 17 on the lever 16. Thus the lever 16 is automatically released and caused to move under the influence of the spring 21 to actuate the brake lever 29 and stop the motor.

Obviously the point in the travel of the tone arm when the reproduction is completed will vary with individual records.

The lever 29 is provided with a handle 33 arranged adjacent the handle 27 Where it is readily accessible and by reason of frictional connection between the levers 29 and 19, the former may be angularly adjusted with respect to the latter by means of the handle 33. The frictional connection between the lovers 29 and 19 offers sufficient resistance to relative movement between the levers to insure withdrawal of the hook shaped end 18 from the abutment 17 when the lug 32 engages the end 31 oi the lever 29.

From the foregoing it will be readily understood that I have perfected a brake mechanism for talking machines which embodies relatively :few and simple parts of inexpensive construction, which is adapted to successfully perform the desired function of automatically stopping the talking machine at the conclusion of the reproduction and which is readily adjustable to individual records.

It will be further understood that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the l a J invention or sacrificing any oi 1ts material advantages, the formhereinbefore described embodiment being thereof.

I claim:

In a brake mechanism for talking machines, the combination of a spindle, a brake device operated by said spindle, and means for operating the spindle comprising a lever rigid with the spindle and having an abutment, a pivoted locking leverhaving a hook end toengage said abutment, an expansion merely a preferred spring arranged between said locking lever and spindle lever and normally tending to swing said spindle lever to apply the brake, an adjusting lever connected to said locking lever for releasing the locking lever from the spindle lever, and an operating lever to move said spindle lever againstthe action of the spring and into engagement with said locking lever.

Trros A. Fn'rrnu, F. B. MODJESKI. 

